Power lithium batteries must have height and depth

The range and safety of electric vehicles have always been the focus of attention of the industry and users. In order to improve the performance of power vehicles, major companies and scientific research institutions have increased their research efforts in the field of batteries and strive to be in the new energy vehicle market. Seize the opportunity. The cruising range has broken through. Recently, Japan's two major electric car manufacturers Toyota and Nissan have respectively announced the latest technological achievements in the field of power lithium batteries. The two companies' new generation of intensive energy reserve power packs can provide longer-lasting driving forces for electric and hybrid vehicles. Toyota Motor Corporation is studying the replacement of lithium electrolyte used in current lithium-ion batteries with magnesium electrolyte. Toyota believes that magnesium has two major advantages over lithium. First, magnesium can permit intensive energy storage. In addition, lithium is an unstable metal element, which is prone to fire. Magnesium is relatively safer. The company's magnesium-based chemical battery will be available in the next 20 years. Nissan is looking for an additive to improve the performance of current lithium-ion batteries and expand energy storage capacity. The technical method adopted by Nissan is to incorporate an additive called amorphous silicon monoxide into the battery to increase the energy storage capacity of lithium-ion batteries. This chemical substance allows the battery to retain more lithium ions, thereby improving the overall performance of the battery. Domestic scientific research institutions have also made the latest progress in this regard. In March of this year, Tang Yongbing and his research team from the Shenzhen Institute of Advanced Technology of the Chinese Academy of Sciences announced the latest results in a new type of high-energy-density aluminum u0026mdash; graphite dual-ion battery technology. This new type of battery adjusts the positive and negative electrodes of traditional lithium-ion batteries, and uses aluminum foil as both the battery's negative electrode material and the negative electrode current collector. The working principle of this battery is different from the traditional lithium ion battery: during the charging process, the positive electrode graphite undergoes an anion intercalation reaction, while the aluminum negative electrode undergoes an aluminum-lithium alloying reaction, and the discharge process is reversed. This new reaction mechanism not only significantly increases the working voltage of the battery, but also greatly reduces the quality, volume, and manufacturing cost of the battery, thereby comprehensively improving the energy density of the battery. According to preliminary estimates, the cruising range of 500Kg aluminum u0026mdash; graphite batteries can reach about 550 kilometers. Compared with traditional lithium battery technology, this battery has distinct advantages, not only reducing the processing cost by about 40%-50%, but also increasing the energy density by at least 1.3-2.0 times. In addition, many companies and institutions have strengthened their research on graphene lithium-ion batteries to overcome the problem of cruising range. Safety issues need to be dealt with urgently. While the high energy density of power lithium batteries is urgently pursued, its safety cannot be underestimated. The recent incidents of fires in electric buses and explosions in battery factories have aroused great concern about the safety of lithium batteries. Part of the reason why there are potential safety hazards in power lithium batteries is that there is a battery cell balance problem in series battery packs. In the process of battery charging and discharging, due to the differences between battery packs, the battery will be overcharged or overdischarged. Overcharge and discharge will cause the battery to burn and explode. In addition, the research stated that taking a ternary lithium-ion battery as an example, when the battery is overcharged, the material composition of the positive electrode is lithium cobalt oxide in the delithiation state, and the negative electrode is lithium-intercalated carbon. Lithium cobaltate undergoes analytical reactions to release oxygen at high temperatures, and the chemical reaction activity of lithium-intercalated carbon is basically similar to that of metallic lithium. So if combustion occurs, it is basically equivalent to burning metal lithium in an oxygen-rich environment, which will cause very serious consequences. Therefore, it is extremely important to equip the power lithium battery with a high-quality bMS battery management system. As an important link between the secondary battery and the electrical appliances, bMS integrates the monitoring and management of the battery or battery pack, and realizes the important functions of real-time monitoring of the battery, automatic balance and intelligent charging and discharging, thereby ensuring the battery or battery pack The safety, reliability, and power output in the best state.